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T. SUGDEN AND A. E. FIELDING.

S'IEAM SUPERHEATER. APPLICAHON FILED DEC. 17.!915.

Patented Oct. 7, 1919.

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T. SUGDEN AND A. E. FIELDING.

STEAM SUPERHEATER.

APPLICATION FILED DEC. 11,1915.

Patented Oct. 7,1919.

4 SHEETS-SHEET 2 T. SUGDEN AND A. E. FIELDING.

STEAM SUPERHEATER.

APPLICATION FILED 05c. 17.1915.

Patented Oct. 7,1919.

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ri-Nrr earns ATENT QFFIEE.

THOMAS SUGIDEN, or LoNnoN, AND

ALFRED EDWARD FIELDING, OF MANCHESTER,

ENGLAND.

' STEAM-SUPERHEATER.

bers or headers, flue tubes and superheater tubes whereby the following advantages are secured :viz: All the superheater elements are alike and interchangeable whereby the construction is simplified and the minimum number of spare elements need be kept; no special tools are required for expanding and drifting; only one or two small parts is or are required to be taken down in order to permit of removing an element any element can be removed'without interfering with the other elements; elements can be replaced and used again without DGOGSSltZLtlIig; re-bending of the tubes; and easy accessibility of the elements and smoke tubes for clean ng purposes is insured as well as ready facility for plugging atube in case of failure.

In the accompanying drawings we have shown by way of example the application of our invention to a locomotive boiler.

' -Figure l is a vertical longitudinal section through alocomotive smoke box showing as much as is necessary of ,the boiler and superheater. 7 V

Fig. 2 is a vertical transverse section through one half of the smoke box and su-- perheater header, the other half being represented in elevation.

Fig. 3 is a longitudinal section through a portion of a superheater of slightly modified construction. v

Fig. 4 is a section on the line Y, Y, Fig. 3 looking upward.

Fig. 5 is a view-of a device for plugging the superheater tubes when required.

Fig. 6 is a sectionillustrating a modified method of connecting the superheater tubes to the header.

Fig. 7 is a view of a deVlCgSlllbLble for plugging the superheater tube in Fig. 6.

Specification of Letters Patent.

Patented Oct. '7, 1919.

Application filed December 17, 1915. Serial No. 67,463.

Fig. 8 is a partial transverse sectional view of a further modified form of header.

Fig. 9 is a sectional elevation, and

Fig. 10 a sectional plan illustrating still another form of header, and

F ig 11 is a sectional elevation of another modification.

Figs. 3 to 11 are drawn to a larger scale than Figs. 1 and 2.

Like letters of reference denote corresponding parts in the several figures.

The header A is shown extending across the upper part of the smoke box B and down each side of the smoke box. That is to say,

the header has two dependent legs, but it may have only one, or in some cases as in marine or other large boilers it may have more than two legs. The header is divided into two chamber by a partition C and one of these chambers communicates with the boiler by a pipe whilethe other communicates with the steam main by pipes E. The

superheater tubes F forming the elements of thesuperheater are secured to the rear walls of boxes G which are arranged in pairs, one box of each pair communicating with one chamber of the header, and the other with the other chamber of the header. The boxes G are however not arranged in line with the corresponding fiue tubes Hbut are displaced upwardly, downwardly, -or laterally with reference thereto, and .consequently the projecting ends of the superheatertubes are necessarily formed with a double bend or crank ,as seen in Fig. 1. When it is required to withdraw an element, the ends of the superheater tubes are detached from the header, the element is pushed rearwardly some distance and then turned through a suitable angle which causes the cranked'ends to move clear .of the header whereupon the element can be withdrawn. movements are made when inserting an element. The disposition of the boxes G of the header is such that any one element can be turned in its smoke tube H as above described without bringing the cranked ends into contact with the adjacent elements, and to allow of employing the maximum number of elements a zigzag arrangement of the boxes G as indicated in Fig. 2 is preferably adopted. The front ends of the boxes G are fitted with removable screw plugs or caps-J to allow of obtaining access to the super- The reverse 7 tube.

Oiipies 01 this patent may be'obtained for Should one of the superheater tubes be-' come damaged, it can be plugged by removmg the sci'ew caps J and replacing same by screw plugs L shown in Fig. 5 which have" a piston like inI'ier end M suitably packed, e. g. with asbestos and adapted to fit tightly in the superheatei" tu'lo'es.

In Figs. 3 and: the supei'heater tubes are showfi secured to'the header by expanding the ends of the tubes. 7 1

In F 6 another'metho'd of attachih'ent is shown. This attachment is efiected. a separate machined tubular connecting piece N screwed on the 'eiid of the superheater This connecting piece is formed with ashoul'derat O and is passed right through the use Gan'd secured by abo'X n'ut P; Comg Inunication between the box G and the superheater tube is made through a slotted opening R. The rod Q- forplugging when required this type vof connection is shown in Fig. 7 1 Y Fig. 8 illustrates a slight modification ofthe shape of the 'bOX'es G which admits of arranging the flue tubes H somewhat closer together while affording all the necessary space for attaching the superheater tubes. In other respects the header is similar'to that shown in Fig. 2;

It will be' Ubvious thata modified form of header may be used in which the boxes G are dispensed with, the superheatertubes being passed right through the header'frorn back to front and being secured by nuts, or said tubes being secured'to separate sleeves or connections N which pass through the header" as shown in Figs. 9 and 10 and are secured by box nuts P. Ports or passages R are formed in the sleeves 01 connections N so that one leg-of the superheater element communicates with one chamber of the header, and the other leg with the other chamber of the header.

A further modification is shown in Fig. 11 in which the superheater tubes F are expanded into the header, and the sleeve N is screwed through the front wall of the header 7 and passes tightly throughthe center wall C and abuts against the back wall of the header, The sleeve passes over the expanded end of the superheater tube. The outer 'eiid of the sleeve N in this modificatioii is shown closed, and is covered by a box nut P. The sleeve leading from one ens-er the sup'erheater element has a port at'R to communicate with one chamber of the header, and the sleeve from the other endfoff the element is similarly slotted to commuiiicate with the other chan'i'ber of the header.

What we claim is 'Iii a steam superheater for steam generators, and in combination, a header, superttibes having threaded ends, a tubular connecting member for each tube removably secti'red to and extended through said headerand having one end to threadedly connect with the threaded end of the tube,

aid connecting ihember having a passage therein connecting the interior thereof with the interior of said header, and a removable Witnesses to the signature of the' said Thomas Sugden:

CONRAD K. FALKnNsTnIN, Y GEO. A. RAFFLES. e

WVitn'esses to the signature of the said Al fred Edward Fielding:

' EDWARD L. BOUTILLIER,

JOHN CRoMPToN.

five cents each, by addressing the flommi'ssioner of Patents, Washington, D; 0. 

